[Answer] A dream vacation could include visiting the World Heritage Sites located here in the United States, like this ancient historic site in what is now Illinois.

Step 1 : Introduction to the question " A dream vacation could include visiting the World Heritage Sites located here in the United States, like this ancient historic site in what is now Illinois. "

...1. Carlsbad Caverns 2. Cahokia Mounds 3. Pueblo de Taos 4. Starved Rock

Step 2 : Answer to the question " A dream vacation could include visiting the World Heritage Sites located here in the United States, like this ancient historic site in what is now Illinois. "

Cahokia Mounds.,:

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